P1B44 Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage
Quick Answer
The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid/EV powertrain control module 1. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1B44 indicates Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage.
- Common causes
- Common causes include Faulty Hybrid/Electric Vehicle Battery Pack.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1B44 Description
The motor control modules test for isolation between each high voltage bus and vehicle chassis whenever high voltage is present at the power inverter module.
What are the Possible Causes of the DTC P1B44?
- Faulty Hybrid/Electric Vehicle Battery Pack
How to Fix the DTC P1B44?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1B44 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1B44 code?
Need more information on how to fix the P1B44 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1B44 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P1B44 Buick — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage
- P1B44 Cadillac — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage
- P1B44 Chevrolet — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage
- P1B44 GMC — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage
- P1B44 Saturn — Drive Motor 2 Control Module Hybrid/EV Battery Voltage Isolation Sensing Circuit 2 High Voltage
Frequently Asked Questions about P1B44 Code
What does the OBDII code P1B44 mean?
P1B44 indicates an issue with the hybrid or EV system, specifically that the Drive Motor 2 Control Module has detected a high voltage problem in the Battery Voltage Isolation Sensing Circuit 2.
What are the symptoms of code P1B44?
Common symptoms include an illuminated check engine light, reduced hybrid/EV performance, limited driving range, or the vehicle possibly entering a fail-safe or limp mode.
What causes the P1B44 code to appear?
The code is often caused by a fault in the voltage isolation sensing circuit, damaged wiring, a malfunctioning Drive Motor 2 Control Module, or a hybrid/EV battery issue.
Can driving with the P1B44 code damage my car?
Driving with this code can potentially lead to further damage to the hybrid/EV system, reduced performance, or safety risks due to high voltage issues. It’s best to address it promptly.
How is the P1B44 code diagnosed?
A technician will use a scan tool to verify the code, inspect the wiring and connectors for damage or corrosion, and test the hybrid/EV battery voltage isolation circuit for faults.
What tools are needed to repair the P1B44 issue?
Common tools include an OBDII scan tool, a multimeter for voltage testing, and manufacturer-specific service manuals for hybrid/EV systems.
Can a loose or corroded connection cause code P1B44?
Yes, loose or corroded wiring or connectors in the voltage isolation sensing circuit can trigger this code by disrupting proper voltage readings.
Does the P1B44 code require hybrid/EV battery replacement?
Not necessarily. The issue might be with the sensing circuit or the control module rather than the battery itself. Proper diagnosis is needed to confirm the cause.
Is P1B44 a common issue in hybrid or EV vehicles?
While not extremely common, it can occur in vehicles with high mileage, poor maintenance, or exposure to harsh conditions affecting electrical components.
Can I clear the P1B44 code without fixing the problem?
Clearing the code without addressing the underlying issue will likely cause it to reappear. Proper diagnosis and repair are necessary to resolve the problem.
Discuss the causes and fixes for P1B44 OBDII Code
Code P1B44 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
